I have found prices on one Czech eshop, not on sale yet, not sure if prices are final.
Barebone version: 5000 CZK (~180 EUR, 130 GBP, 200 USD)
Celeron N3000 1.04GHz (4W), Turboboost 2.08GHz, Intel HD Graphics, no RAM, no HDD, WiFi, Bluetooth, infraport, 3x USB 3.0, USB 3.1 (USB-C), GLAN, 2x HDMI, DisplayPort, VESA, no OS
Version with 4GB RAM and 128GB SSD: 6500 CZK (~240 EUR, 170 GBP, 260 USD)
Celeron N3000 1.04GHz (4W), Turboboost 2.08GHz, Intel HD Graphics, RAM 4GB, SSD 128GB mSATA, WiFi, Bluetooth, infraport, 3x USB 3.0, USB 3.1 (USB-C), GLAN, 2x HDMI, DisplayPort, VESA, no OS
There should be third version with 32GB SSD, 2GB RAM and Windows 8.1 with Bing. Not listed in the store...
It should be able to play 4K video according to one of images in this article:
http://www.cnews.cz/asrock-chysta-vlastn...rannym-usb
Image (text in bottom left corner):
http://www.cnews.cz/sites/default/files/...box_04.jpg
EDIT:
Prices are including VAT 21% and assuming they are correct and that Czech prices are usually a bit higher, final price in EUR, GBP or USD can be a little less.